Lamp base



FIG. 1 is a perspective view of a lamp base showing our new design;

FIG. 2 is a top plan view thereof on an enlarged scale;

FIG. 3 is a side elevational view thereof on an enlarged scale, the opposite side being identical;

FIG. 4 is a fragmentary partially segmented view taken along lines IV--IV in FIG. 2.

Portions of a lamp are shown in broken lines in FIGS. 1 and 2 for illustrative purposes only. 

The ornamental design for a lamp base, as shown and described. 